Electronic phase diagram of FeSe<sub>1-<i>x</i></sub>Te<i><sub>x</sub></i> under high pressure

ORAL

Abstract

FeSe has the simplest crystal structure among the iron-based superconductors and is known to have a nonmagnetic nematic order. When selenium is substituted by the isovalent element, sulfur, the nematic phase is suppressed and a nematic quantum critical point without magnetism appears. On the other hand, under pressure, a dome-shaped magnetic phase is induced and the superconducting transition temperature rises from 9 K to 37 K.
In this study, we focus on FeSe1-xTex in which selenium is substituted by tellurium. In order to clarify the relationship between the nematic phase and the superconducting phase, we have synthesized bulk single crystals of FeSe1-xTex (0<x<0.22) by using the chemical vapor transport method. The temperature dependence of the electrical resistivity was measured on the FeSe1-xTex crystals under pressure up to 8 GPa using a constant loading cubic anvil high-pressure apparatus. As a result, we have established the three-dimensional electronic phase diagram; temperature against pressure and Te-substitution. The obtained phase diagram indicates that the tellurium substitution shifts the pressure-induced magnetic phase to a lower pressure side, which is in contrast to the sulfur substitution case.

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Presenters

  • Kiyotaka Mukasa

    • Department of Advanced Materials Science, University of Tokyo

Authors

  • Kiyotaka Mukasa

    • Department of Advanced Materials Science, University of Tokyo

  • Kohei Matsuura

    • Univ of Tokyo
    • Department of Advanced Materials Science, University of Tokyo
    • Department of Advanced Materials Science, The University of Tokyo
    • Univ of Tokyo-Kashiwanoha

  • Yuichi Sugimura

    • Univ of Tokyo
    • Department of Advanced Materials Science, University of Tokyo

  • Muku Otani

    • Department of Advanced Materials Science, University of Tokyo

  • Mingwei Qiu

    • Univ of Tokyo
    • Department of Advanced Materials Science, University of Tokyo
    • Department of Advanced Materials Science, The University of Tokyo

  • Mikihiko Saito

    • Univ of Tokyo
    • Department of Advanced Materials Science, University of Tokyo

  • Yuta Mizukami

    • Department of Advanced Materials Science, University of Tokyo

  • Kenichiro Hashimoto

    • Department of Advanced Materials Science, University of Tokyo
    • Department of Advanced Materials Science, The University of Tokyo
    • Department of Advanced Material Science, University of Tokyo

  • Jun Gouchi

    • Institute for Solid State Physics, University of Tokyo
    • Institute for Solid State Physics, The University of Tokyo

  • Yoshiya Uwatoko

    • Institute for Solid State Physics, University of Tokyo
    • Institute for Solid State Physics, The University of Tokyo
    • Institute for Solid State Physics, Univ of Tokyo

  • Takasada Shibauchi

    • Advanced Materials Science, University of Tokyo
    • Univ of Tokyo-Kashiwanoha
    • Department of Advanced Materials Science, University of Tokyo
    • Univ of Tokyo
    • Dept. Adv. Mat. Sci., Univ. Tokyo
    • Univ. of Tokyo
    • Department of Advanced Materials Science, The University of Tokyo
    • Department of Advanced Material Science, University of Tokyo